如何在快速iOS应用程序中创建简单播放器

Question

我试图创建一个简单的iOS应用程序与一个播放器。有一个按钮，当您单击该按钮时，它应该播放该流。我的代码如下：

@IBAction func playVideo(_ sender: UIButton) {
    let url = URL(string: "https://.../index.m3u8")!

    // Create the asset instance and the resouce loader because we will be asked
    // for the license to playback DRM protected asset.
    let asset = AVURLAsset(url: url)
    let queue = DispatchQueue(label: "FP License Acquire")
    asset.resourceLoader.setDelegate(self, queue: queue)

    // Create the player item and the player to play it back in.
    let playerItem = AVPlayerItem(asset: asset)
    let player = AVPlayer(playerItem: playerItem)

    // Create a new AVPlayerViewController and pass it a reference to the player.
    let controller = AVPlayerViewController()
    controller.player = player

    // Modally present the player and call the player's play() method when complete.
    present(controller, animated: true) {
        player.play()
    }

}

但是，对于"asset.resourceLoader.setDelegate(self，queue: queue)“行，我得到以下错误消息：

"Cannot convert value of type 'ViewController' to expected argument type 'AVAssetResourceLoaderDelegate?'  Insert ' as! AVAssetResourceLoaderDelegate'"

当我插入'as！AVAssetResourceLoaderDelegate‘时，它会给出以下运行时错误：

Could not cast value of type 'DRMTest.ViewController' (0x1009ae0c8) to 'AVAssetResourceLoaderDelegate' (0x1126ebf00).

/I对于快速和iOS的发展来说是非常新鲜的。我不明白这个问题，也不知道该怎么做。我只需要一个简单的AVPlayer

Answer 1

您的视图控制器应该遵循AVAssetResourceLoaderDelegate委托来解决错误，所以代码应该是，

class ViewController: UIViewController, AVAssetResourceLoaderDelegate {
    @IBAction func playVideo(_ sender: UIButton) {
        let url = URL(string: "https://.../index.m3u8")!

        // Create the asset instance and the resouce loader because we will be asked
        // for the license to playback DRM protected asset.
        let asset = AVURLAsset(url: url)
        let queue = DispatchQueue(label: "FP License Acquire")
        asset.resourceLoader.setDelegate(self, queue: queue)

        // Create the player item and the player to play it back in.
        let playerItem = AVPlayerItem(asset: asset)
        let player = AVPlayer(playerItem: playerItem)

        // Create a new AVPlayerViewController and pass it a reference to the player.
        let controller = AVPlayerViewController()
        controller.player = player

        // Modally present the player and call the player's play() method when complete.
        present(controller, animated: true) {
            player.play()
        }
    }
}